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摘要 ：
Nano-zero-valent iron (nZVI), as a typical nano-material, has been recently used in wastewater treatment and combination with bioreactors. Using nZVI coupled denitrification system research the effect and influence of nZVI enhanced denitrification sludge on the degradation of toxic compounds and system performance. The nZVI coupled denitrification system showed better resistance to 2,6-DCP impact, and the concentrations of effluent NO2- and NO3- were below 2.0 mg/L. At the same time, the addition of nZVI enabled the denitrification system to quickly adapt to the toxic environment of 2,6-DCP within 15 days, and the degradation efficiency of 2,6-DCP reached 99.9%. The released SMP reduced after nZVI coupled with denitrification sludge in 2,6-DCP environment, which could improve the effluent water quality. Nuclear magnetic resonance spectroscopy showed that the addition of nZVI would change the structure of EPS in denitrification sludge. After 90 days of operation, the dominant bacteria in the denitrifying sludge have undergone great changes. Moreover, Thauera was responsible as the dominant bacteria for degrading 2,6-DCP in the denitrification system. The increased in the proportion of functional bacteria with nitrate_reduction, nitrogen_respiration, nitrate_respiration and nitrite_respiration in the presence of NZVI further reveals the mechanism of enhanced denitrification.
关键词 ：
2,6-dichlorophenol 2,6-dichlorophenol Denitrification Denitrification Microbial structure Microbial structure Molecular weight Molecular weight Nano-zero-valent iron Nano-zero-valent iron
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| GB/T 7714 | Li, Mingrun , Wei, Dong , Zhang, Zhaoran et al. Enhancing 2,6-dichlorophenol degradation and nitrate removal in the nano-zero-valent iron (nZVI) solid-phase denitrification system [J]. | CHEMOSPHERE , 2022 , 287 . |
| MLA | Li, Mingrun et al. "Enhancing 2,6-dichlorophenol degradation and nitrate removal in the nano-zero-valent iron (nZVI) solid-phase denitrification system" . | CHEMOSPHERE 287 (2022) . |
| APA | Li, Mingrun , Wei, Dong , Zhang, Zhaoran , Fan, Dawei , Du, Bin , Zeng, Huiping et al. Enhancing 2,6-dichlorophenol degradation and nitrate removal in the nano-zero-valent iron (nZVI) solid-phase denitrification system . | CHEMOSPHERE , 2022 , 287 . |
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摘要 ：
In this study, the filamentous bulking was demonstrated to improve anammox capability and anammox bacteria (AnAOB) population density under organic stress. The selective heterotrophic bacteria (HB) washout that involved in shear detachment, enmeshment and biomass washout was triggered. The microbial spatial distri-bution and granular detachment properties revealed that the filamentous bulking transferred the "location advantage" of HB from granules interior to surface, and endowed granular surface low shear tolerance for shear detachment, ultimately resulted in selective HB detachment. The detached filaments-mediated enmeshment provided additional selective pressure for free HB-flocs, eventually achieving the retention time differentiation between AnAOB (34 - 141 days) and HB (3 - 15 days), and a high anammox population density. Controlling dissolved oxygen level was crucial for regulating sludge bulking. Collectively, the filamentous bulking was developed as an effective anti-organic stress strategy to broaden the application of granular anammox process in actual wastewater treatment.
关键词 ：
Selective biomass washout Selective biomass washout Enmeshment Enmeshment Sludge retention time Sludge retention time Sludge disintegration Sludge disintegration Shear detachment Shear detachment
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| GB/T 7714 | Wei, Ziqing , Li, Dong , Li, Shuai et al. Improving anammox performance by limited filamentous bulking for wastewater treatment with organic stress [J]. | BIORESOURCE TECHNOLOGY , 2022 , 369 . |
| MLA | Wei, Ziqing et al. "Improving anammox performance by limited filamentous bulking for wastewater treatment with organic stress" . | BIORESOURCE TECHNOLOGY 369 (2022) . |
| APA | Wei, Ziqing , Li, Dong , Li, Shuai , Hao, Tongyao , Zeng, Huiping , Zhang, Jie . Improving anammox performance by limited filamentous bulking for wastewater treatment with organic stress . | BIORESOURCE TECHNOLOGY , 2022 , 369 . |
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摘要 ：
A novel strategy combining aerobic starvation and free ammonia (FA) was proposed to achieve partial nitrifi-cation (PN). The impact of the combined strategy on nitrifying bacteria was explored in a 200-day experiment. The effluent concentration of ammonia was below the detection limits (0.1 mg/L), and the effluent concentration of nitrite and nitrate was 68.12 mg/L and 3.46 mg/L without adding carbon source to the artificial wastewater. The nitrite accumulation rate (NAR) was maintained at 90.15% even when the dissolved oxygen (DO) con-centration was 1.50 mg/L. Further analysis showed that PN was achieved by selectively restoring the activity of ammonia-oxidizing bacteria (AOB) in nitrifying bacteria that had lost their activity after starvation. The specific ammonia oxidation rate (SAOR) was 46.25 mg N/g MLVSS/h, and the specific nitrate product rate (SNPR) was only 0.73 mg N/g MLVSS/h in the stable operation stage. The increase in AOB abundance (from 2.79% to 7.13%) and the decrease in nitrite-oxidizing bacteria (NOB) abundance (from 8.75% to 1.44%) explained this phe-nomenon. Finally, the analyses on the secretion of extracellular polymer substance (EPS), strategies to resist harsh environments, and physical properties of sludge explored the potential mechanism and provided references for applying the combined strategy.
关键词 ：
Starvation Starvation Mechanism Mechanism Free ammonia Free ammonia Partial nitrification Partial nitrification
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| GB/T 7714 | Li, Dong , Chen, Hao , Gao, Xin et al. Achieving PN through the selective recovery of AOB activity in inactivated nitrifying bacteria: Combined aerobic starvation and FA [J]. | JOURNAL OF ENVIRONMENTAL MANAGEMENT , 2022 , 321 . |
| MLA | Li, Dong et al. "Achieving PN through the selective recovery of AOB activity in inactivated nitrifying bacteria: Combined aerobic starvation and FA" . | JOURNAL OF ENVIRONMENTAL MANAGEMENT 321 (2022) . |
| APA | Li, Dong , Chen, Hao , Gao, Xin , Zhang, Jie . Achieving PN through the selective recovery of AOB activity in inactivated nitrifying bacteria: Combined aerobic starvation and FA . | JOURNAL OF ENVIRONMENTAL MANAGEMENT , 2022 , 321 . |
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摘要 ：
In this experiment, the effects of different stirring methods on the rejuvenation and operation of anaerobic ammonium oxidation sludge under normal temperature (21±1) conditions were investigated. Three groups of reactors (R1, R2, and R3) were studied, and the stirring methods were continuous stirring for R1 and intermittent stirring with different rotation speeds for R2 and R3. The denitrification performance and the performance of granular sludge during system rejuvenation and operation process were analyzed. Results show that the removal rates of ammonia nitrogen and nitrite nitrogen of R1, R2, and R3 were close to 100% in 10, 2 and 2 d, respectively. The anaerobic ammonium oxidation rates of R2 and R3 were higher, which were more suitable for the growth of anammox bacteria. According to the results of cycle test, the fluidization state of the water flow formed by the intermittent stirring method was weak, so that the reactor had lower dissolved oxygen for a longer period, and it was easier to inhibit the activity of AOB, thereby increasing the activity of the anammox bacteria. The R1 system provided strong shearing force and had continuous contact with the substrate solution, resulting in more EPS. At the end of the static operation phase, the average particle size of granular sludge in R1, R2, and R3 was 723, 675 and 649 μm, respectively. Copyright ©2021 Journal of Harbin Institute of Technology.All rights reserved.
关键词 ：
Ammonia Ammonia Bacteria Bacteria Dissolved oxygen Dissolved oxygen Endocrinology Endocrinology Flow of water Flow of water Fluidization Fluidization Granular materials Granular materials Nitrogen Nitrogen Nitrogen removal Nitrogen removal Oxidation Oxidation Particle size Particle size Wastewater treatment Wastewater treatment
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| GB/T 7714 | Li, Dong , Cao, Zhengmei , Zhang, Jie et al. Effect of different stirring methods on rejuvenation and operation of anaerobic ammonium oxidation sludge [J]. | Journal of Harbin Institute of Technology , 2021 , 53 (5) : 1-8 . |
| MLA | Li, Dong et al. "Effect of different stirring methods on rejuvenation and operation of anaerobic ammonium oxidation sludge" . | Journal of Harbin Institute of Technology 53 . 5 (2021) : 1-8 . |
| APA | Li, Dong , Cao, Zhengmei , Zhang, Jie , Zhang, Shirui , Li, Shuai . Effect of different stirring methods on rejuvenation and operation of anaerobic ammonium oxidation sludge . | Journal of Harbin Institute of Technology , 2021 , 53 (5) , 1-8 . |
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摘要 ：
Hollow anaerobic ammonium oxidation (Anammox) granular sludge formed and became the main part in the treatment of low-strength ammonia wastewater. The characteristics and formation mechanism of hollow Anammox granular sludge were investigated in a continuous stirred tank reactor (CSTR) at room temperature. Granular sludge was found to be cavitated, and Candidatus Kuenenia was the dominant bacteria that lived and coexisted with other bacteria in walls under an extracellular polymeric substance (EPS) shield. The EEMPARAFAC analysis was applied to characterize the EPS, while EPS secretion was the expression of specific Anammox activity. Tryptophan or protein-like was the active component of proteins (PN) as the main part of EPS in granules. These results confirm that hollow Anammox granular sludge is suitable for low-strength ammonia sewage. Finally, a conceptual model of hollow Anammox granules growth and breakage was developed, and cavitation was a key step of regranulation.
关键词 ：
Hollow granules Hollow granules Low-strength ammonia Low-strength ammonia Anammox Anammox Extracellular polymer substance Extracellular polymer substance
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| GB/T 7714 | Wang, Wenqiang , Li, Dong , Li, Shuai et al. Characteristics and formation mechanism of hollow Anammox granular sludge in low-strength ammonia sewage treatment [J]. | CHEMICAL ENGINEERING JOURNAL , 2021 , 421 . |
| MLA | Wang, Wenqiang et al. "Characteristics and formation mechanism of hollow Anammox granular sludge in low-strength ammonia sewage treatment" . | CHEMICAL ENGINEERING JOURNAL 421 (2021) . |
| APA | Wang, Wenqiang , Li, Dong , Li, Shuai , Zeng, Huiping , Zhang, Jie . Characteristics and formation mechanism of hollow Anammox granular sludge in low-strength ammonia sewage treatment . | CHEMICAL ENGINEERING JOURNAL , 2021 , 421 . |
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摘要 ：
In the presence of organic matter, the granular anammox system under sequencing batch mode showed more robust anammox performance than that under completely mixed mode, which was attributed to the better biomass retention with high settling ability and stability of granular sludge. Based on the specific anammox activity test, stratified and mixed distribution of heterotrophic bacteria was found under completely mixed and sequencing batch mode, respectively. The stratified microbial distribution resulted in low enzyme activity of anammox bacteria and sludge disintegration by hindering substrate transfer with a large accumulation of EPS on the granular surface. Whereas the heterotrophic bacteria mixed in granules (mixed microbial distribution) act as a "skeleton", which increased the particle size, density, and stability of granular sludge. Compared with biokinetic-based selection, diffusion-based selection with high substrate penetration depth more likely resulted in the mixed granular structure and strong resistance to organic inhibition under sequencing batch mode.
关键词 ：
Operational mode Operational mode Bio-kinetic selection Bio-kinetic selection Diffusion-based selection Diffusion-based selection Spatial growth distribution Spatial growth distribution Mixotrophic anammox granule Mixotrophic anammox granule
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| GB/T 7714 | Li, Dong , Wei, Ziqing , Li, Shuai et al. Operational mode affects the role of organic matter in granular anammox process [J]. | BIORESOURCE TECHNOLOGY , 2021 , 336 . |
| MLA | Li, Dong et al. "Operational mode affects the role of organic matter in granular anammox process" . | BIORESOURCE TECHNOLOGY 336 (2021) . |
| APA | Li, Dong , Wei, Ziqing , Li, Shuai , Wang, Wenqiang , Zeng, Huiping , Zhang, Jie . Operational mode affects the role of organic matter in granular anammox process . | BIORESOURCE TECHNOLOGY , 2021 , 336 . |
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摘要 ：
While many studies have successfully used plant extracts to biosynthesize iron nanoparticles as low-cost, sustainable and high-performance materials for removing Cr(VI) from aqueous solution, the exact removal mechanism involved remains poorly understood. In this research, a green tea extract was employed both as a reducing and coating agent to prepare iron nanoparticles (GT-nFe) via an environmentally friendly green synthesis method, where the material so produced was then used to remove Cr(VI) from aqueous solution. The efficiency in removing Cr(VI) using GT-nFe reached 90.2 % at an initial Cr(VI) concentration of 60mgL−1 and pH of 5.0. Kinetic and thermodynamic analysis indicated that Langmuir isotherm and pseudo-second order models best described the adsorption of Cr(VI) by GT-nFe. Thermodynamic studies revealed that adsorption was spontaneous (ΔG00>0). Application of advanced characterization techniques, including SEM-EDS, TEM and XPS, indicated a detailed Cr(VI) removal mechanism involving both adsorption and redox reactions. © 2021 Elsevier B.V.
关键词 ：
Green Synthesis Green Synthesis Iron Iron Chromium compounds Chromium compounds Adsorption Adsorption Redox reactions Redox reactions Biochemistry Biochemistry Thermoanalysis Thermoanalysis Tea Tea Isotherms Isotherms Chromium metallography Chromium metallography Chemicals removal (water treatment) Chemicals removal (water treatment) Plant extracts Plant extracts Iron compounds Iron compounds Nanoparticles Nanoparticles Thermodynamic properties Thermodynamic properties Extraction Extraction Iron research Iron research
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| GB/T 7714 | Hao, Runqin , Li, Dong , Zhang, Jie . Insights into the removal of Cr(VI) from aqueous solution using plant-mediated biosynthesis of iron nanoparticles [J]. | Environmental Technology and Innovation , 2021 , 23 . |
| MLA | Hao, Runqin et al. "Insights into the removal of Cr(VI) from aqueous solution using plant-mediated biosynthesis of iron nanoparticles" . | Environmental Technology and Innovation 23 (2021) . |
| APA | Hao, Runqin , Li, Dong , Zhang, Jie . Insights into the removal of Cr(VI) from aqueous solution using plant-mediated biosynthesis of iron nanoparticles . | Environmental Technology and Innovation , 2021 , 23 . |
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摘要 ：
The inhibition of the on/off aeration time ratio on nitrite oxidizing bacteria (NOBs) in intermittent aeration is the key to accumulating nitrite. This study explores the stable operation of nitrosated granular sludge under the same frequency of aeration and different combinations of stop exposure time. At 25-28, aerobic granular sludge was inoculated into a sequencing batch reactor (SBR) (R0) and acclimatized to nitrosated granular sludge by intermittent aeration and dissolved oxygen (DO) restriction. The effects of different on/off aeration time ratios in one sub-aeration cycle (3 min:3 min; 4 min:2 min; 2 min:4 min) on the performance of nitrosated granular sludge were analyzed using three same sets of SBRs (R1, R2, and R3). Experiments showed that the nitrite accumulation rates of R1 and R2 were higher, with average nitrite accumulation rates of 89% and 95%, respectively. The nitrosation performance of R3 was poor, and the nitrite accumulation rate at the end of the operation cycle was only 57%. The results showed that when the off-aeration time was between 2 and 4 minutes, the longer the off-aeration time was, the more stable the granular sludge structure was; hence, a good nitrosation performance could be maintained. When the off aeration time was less than 2 minutes, the alternation of anaerobic and aerobic environment could not be fully realized, which resulted in the sludge tending to stay in an environment of continuous aeration. Thus, the environmental advantage of intermittent aeration was lost; the NOBs could not be inhibited, and the granular sludge was disintegrated thereby leading to the deterioration of the nitrosation performance. Additionally, the longer aeration time contributed to the development of irregularly shaped particles. The longer the off-aeration time was, the higher the PN/PS value was, which was beneficial to the enhancement of the hydrophobicity of the particle surface and the sludge settling performance. © 2020, Science Press. All right reserved.
关键词 ：
Bacteria Bacteria Batch reactors Batch reactors Deterioration Deterioration Dissolved oxygen Dissolved oxygen Granular materials Granular materials Nitration Nitration
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| GB/T 7714 | Zhang, Jie , Lao, Hui-Mei , Li, Dong et al. Effect of On/Off Aeration Time Ratio Under High Frequency On/Off Aeration on Performance of Nitrosated Granular Sludge [J]. | Environmental Science , 2020 , 41 (1) : 360-367 . |
| MLA | Zhang, Jie et al. "Effect of On/Off Aeration Time Ratio Under High Frequency On/Off Aeration on Performance of Nitrosated Granular Sludge" . | Environmental Science 41 . 1 (2020) : 360-367 . |
| APA | Zhang, Jie , Lao, Hui-Mei , Li, Dong , Wei, Zi-Qing . Effect of On/Off Aeration Time Ratio Under High Frequency On/Off Aeration on Performance of Nitrosated Granular Sludge . | Environmental Science , 2020 , 41 (1) , 360-367 . |
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摘要 ：
To explore the removal route of ammonia nitrogen, a biological purification process operation test for high concentration of iron and manganese associated ammonia nitrogen [Fe() 9.2-15.1 mg/L, Mn() 0.6-1.4 mg/L, NH4+-N 0.9-2.0 mg/L] was carried out at low temperature (5-6 ) in a groundwater plant for iron, manganese, and ammonia nitrogen removal. Results show that the filter column had good removal effect of ammonia nitrogen at the initial stage of start-up. The analysis along the process and the adsorption test of mature filter material and backwash sludge show that when the influent ammonia nitrogen was about 1.1 mg/L, the ammonia nitrogen was mainly removed by the iron and manganese oxides in the upper part of the filter layer, and the removal rate by biological action was very small. In order to further explore the biological and adsorption effects of filter column on ammonia nitrogen, gradient was used to adjust the concentration of ammonia nitrogen in influent. With the increase of the influent ammonia nitrogen concentration, the ammonia nitrogen removal by biological action increased. Under the condition of influent iron and manganese concentration, the ammonia nitrogen removal by iron and manganese oxides adsorption was about 1 mg/L in the upper 20 cm range of the filter. © 2020, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.
关键词 ：
Adsorption Adsorption Ammonia Ammonia Chemicals removal (water treatment) Chemicals removal (water treatment) Groundwater Groundwater Iron oxides Iron oxides Manganese oxide Manganese oxide Nitrogen removal Nitrogen removal Purification Purification Temperature Temperature
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| GB/T 7714 | Zhang, Jie , Mei, Ning , Li, Dong et al. Removal route of ammonia nitrogen in purification process of low temperature groundwater containing high concentration of iron and manganese associated ammonia nitrogen [J]. | Journal of Harbin Institute of Technology , 2020 , 52 (6) : 85-93 . |
| MLA | Zhang, Jie et al. "Removal route of ammonia nitrogen in purification process of low temperature groundwater containing high concentration of iron and manganese associated ammonia nitrogen" . | Journal of Harbin Institute of Technology 52 . 6 (2020) : 85-93 . |
| APA | Zhang, Jie , Mei, Ning , Li, Dong , Liu, Menghao , Wang, Liuyu , Yang, Hang . Removal route of ammonia nitrogen in purification process of low temperature groundwater containing high concentration of iron and manganese associated ammonia nitrogen . | Journal of Harbin Institute of Technology , 2020 , 52 (6) , 85-93 . |
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摘要 ：
In a groundwater plant we carried out a process operation test of biological removal of iron and manganese nitrification coupled with completely autotrophic ammonium removal over nitrite (CANON) (Fe() 2.91-6.35 mg•L-1, Mn() 0.47-0.98 mg•L-1, NH4+-N 1.15-2.26 mg•L-1) at low temperature (6-8), to explore the effects of filter speed and water quality on ammonia nitrogen removal. The results showed that the mature low-temperature biological filter column, which had been out of service for one month, was cultured for 40 days at a filtration rate of 2 m•h-1 and successfully started. In this process, when the water inlet concentration remained the same, the improved filter speed would reduce the efficiency of ammonia nitrogen capture by the filter column, increase the concentration of ammonia nitrogen in the depth of the filter layer, and improve the efficiency of ammonia nitrogen ions capture by anaerobic ammonia oxidation bacteria (AnAOB) in the depth of the filter layer, so that the ammonia nitrogen removed by CANON in the water increased, while the ammonia nitrogen removed by nitrification decreased. When the filter speed remained unchanged, the concentration of ammonia nitrogen in water was increased to make the ammonia nitrogen with higher concentration enter the filter layer, which increased the concentration of ammonia nitrogen in the zone where ammonia nitrogen and nitrous nitrogen coexist, and improved the net catching efficiency of AnAOB on ammonia nitrogen ions in the filter layer, thus resulting in an increase in ammonia nitrogen removed by CANON. © 2020, Science Press. All right reserved.
关键词 ：
Ammonia Ammonia Concentration (process) Concentration (process) Efficiency Efficiency Groundwater Groundwater Iron Iron Iron removal (water treatment) Iron removal (water treatment) Manganese removal (water treatment) Manganese removal (water treatment) Nitrification Nitrification Nitrogen removal Nitrogen removal Passive filters Passive filters Speed Speed Temperature Temperature Water quality Water quality
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| GB/T 7714 | Zhang, Jie , Mei, Ning , Liu, Meng-Hao et al. Effect of Filter Speed and Water Quality on Ammonia Removal in Groundwater Containing Iron, Manganese, and Ammonia at Low Temperature [J]. | Environmental Science , 2020 , 41 (3) : 1236-1245 . |
| MLA | Zhang, Jie et al. "Effect of Filter Speed and Water Quality on Ammonia Removal in Groundwater Containing Iron, Manganese, and Ammonia at Low Temperature" . | Environmental Science 41 . 3 (2020) : 1236-1245 . |
| APA | Zhang, Jie , Mei, Ning , Liu, Meng-Hao , Ye, Xue-Song , Li, Dong . Effect of Filter Speed and Water Quality on Ammonia Removal in Groundwater Containing Iron, Manganese, and Ammonia at Low Temperature . | Environmental Science , 2020 , 41 (3) , 1236-1245 . |
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